A farmer just outside of Ann Arbor, Michigan, discovered a prehistoric mammoth skeleton. He made the find when he was installing a natural gas line in his wheat field, and researchers from the University of Michigan were called in to excavate. (Video via University of Michigan)
Roughly 20 percent of the animal's bones were uncovered along with what the researchers think is a stone tool. That and the way the bones were organized could be signs that humans butchered it.
Researchers believe ancient humans used large stones to anchor the meat in a pond where they could have retrieved it later.
Mammoths were elephant-like creatures that disappeared from North America almost 12,000 years ago. The bones from this recent find still need to be dated, but if they're confirmed as 15,000 years old, it could mean humans came to the area much earlier than we thought.
